31311221012201 has 16 divisors (see below), whose sum is σ = 33943629635328. Its totient is φ = 28710797544000.

The previous prime is 31311221012161. The next prime is 31311221012251. The reversal of 31311221012201 is 10221012211313.

It is a de Polignac number, because none of the positive numbers 2^k-31311221012201 is a prime.

It is a super-2 number, since 2×31311221012201² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311221012251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213829031 + ... + 213975411.

It is an arithmetic number, because the mean of its divisors is an integer number (2121476852208).

Almost surely, 2^{31311221012201} is an apocalyptic number.

It is an amenable number.

31311221012201 is a deficient number, since it is larger than the sum of its proper divisors (2632408623127).

31311221012201 is a wasteful number, since it uses less digits than its factorization.

31311221012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255512.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31311221012201 its reverse (10221012211313), we get a palindrome (41532233223514).

The spelling of 31311221012201 in words is "thirty-one trillion, three hundred eleven billion, two hundred twenty-one million, twelve thousand, two hundred one".